I will be honest, the differences I mention are from posts that were at the SM forums, like splotches in the render as in this post:

https://forum.smithmicro.com/topic/877/idl-in-poser-11-a-step-back-from-poser-10/2

or this one for example:

https://forum.smithmicro.com/topic/9619/black-splotches-on-final-render

The 32 bit issue. As you have to update to carry on using Poser, this thread in the P11 technical forum shows that P11.2 will not even install on a 32 bit machine. https://www.renderosity.com/mod/forumpro/?thread_id=2938006 Therefore you will lose your ability to use Poser.

As for the features you mentioned that are in both versions, I agree, however if someone's workflow involves the GameDev features and then utilising PoserFusion then they will be out of luck.

I have a 64bit system so I'm OK. I'm lucky in that my GameDev was an upgrade from 2014, so I just reverted it back to 2014, and updated my PPro11.1 to PoserPro11.2 without problems.

So I was just listing reasons as to why somebody may not want to upgrade that's all.